Tool holder



July 15 i924. LAS

W. A. PEcK T'ooL HOLDER .Filed June 121: 192s 77 7 I /f y /f/ 7g//Q 42 #//7 Eng /24 L: y

Patented duly 15, 1924.

TOOL HOLDER.

Applieatn iledJune 14, 1923. Serial No. 645,315.

To all 'whom it may concern Beit known that I, WILLIAM A. PECK, a citizen of the United States, residingv at New Haven, in the countyof New Haven and 'State of Connecticut, havel invented certain new and useful ImprovementsA in rIool Holders, of which the following is a specification, yreference being had to the'accompanying drawings.

This invention relates to-tool holders and more particularly to an extension shank for a wood bit or auger.

f An important object of the invention is to provide ina device of this character a socket for the reception of kthe squared por tion of the shank of the auger, in combination with a segmental sleeve which by its engagement in the socket forces the squared portion of the shank of t-he tool linto a portion of the socket formed to receive the same and at the same time grasps a round portion of the shank to steady the saine.. i

A further object of the invention is to provide in a structure of this character a construction whereby the segments of the sleeve are enabled to operate as retaining clamping jaws. f :Y

A still further obj ect ofthe same is to provide a device 'of this character which pro vides a' three-point retaining engagement between thesocket and the shank.

Theseand other objects I attain by the construction lshown in they accompanying draWingawherein fork vthe purpose of illus tration is shown a preferred embodiment of my invention and wherein Figure 1 is a side elevation of a tool constructed in accordance with my invention;

Figure 2 is a vertical sectional view showing the tool before the locking sleeve is fully inserted;v f

Figure 3 is a similar view showing the locking sleeve fuliy inserted; i

Figure 4 is a section on. the line 4 4- of Figure 3 and Figure 5 iis va section on the line 5f-L5 of Figure 2. j y

Referring now more particularly to the drawings, the numeral 101 indicates a' tool holder having a socket 11 formed to nt the squared tapered head 12 of an auger orv similar boring instrument 13. The toolv holder is provided at thatV end thereof having j formed therein the socket 111with a Vtubi-ilarv 'extension' 14;,- the interior'wsi'irface vof which adjacent the outer end isprovided with screw threads 15. Between the screw threads and the inner end of the tubular eX- tension, the wall of the extension is relieved, ras at 16, to a depth such that its internal. diameter lis greater than the diameter'of the'tubular extension at the base of the threads 15. 4

In combination with a tool holder of this character Iy provide a sleeve 17 which is formed of a plurality of sections 18 which may be assembled about the shank 19 of the bit. As is well-known vto those familiar with the art, theA shanks 19 of these bits are of less size than the squared heads 12 thereof and are connected with these squared heads by a conical portion 20. The inner end of the sleeve 17 isy provided with external screw threads 21 coacting with the internal screw threads 15 of the tubular eX- tension 14:. The outer end of the sleeve is provided with av knurled portion 22 for engagement bythe handV so that the sleeve may be rotated. Adjacent faces of, the outer ends of the sections 18 are relieved. In the present instance this relief is accomplished by forming in these adjacent faces interlocking teeth 23, the depth ofthe teeth increasing toward the outer end of the sections. The outer surface of the sleeve at the threaded inner end thereof is relieved as indicated at 24.-, the degree of relief increasing towardthe Vinner end of the sleeve. The inner end 'fa-ce ofthe sleeve is tapered, asl at 25, for coaction with the conical portion 20'conne'cting the head andv shank of the bit.

In practice the threads on the sleevesections V18 initially loosely engage in the threads 15 of the tubular extension. The drill isf first inserted and seated in the socket 11. The sleeve is then assembled about the -shank Vof the drill and theend thereof engaged about the screw threads and the sleeve rotated until the inner'end thereof has forced the head 12 of the bit into firm engage ment with the socket 11. Continued rotation of the sleeve will cause the sections 18 therecf to spread at their inner ends,- forcing the threads 21 into firm engagement with the threads 15 of the tubular extension so that these threads provideA a fulcrum upon which the sections swing under the wedging `action applied to the innerrends thereof. This swinging ofl the sections forces the outer ends of the sectionsfinto rm engagement with the shank of the'tool, with the result that the bit is very firmly held, the head end thereof being firmly seated in the socket and being held against withdrawal from the socket by the inner end of the sleeve and the shank of the'drill being engaged and centered by the outer ends of the sections. In order to permit of the insertion of drills the heads of which are larger than the internal diameter of the threaded portion of the socket of the holder, I form in the threads 15 of the tubular extension 14 notches 26 aligning with and forming continuations of the corners of the squared socket 11, thus permitting the useV of a bit the head of which is greater in diagonal cross section than the internal diameter of the threads 15. f

From the foregoing itwill be obvious that the strain placed upon the bit is resisted at three points and accordingly the bit will be Very firmly held. :It will furthermore be` obvious that the structure hereinbefore set forth is capable of some change and modification without in any manner departing from the spirit of my invention and I accordingly do not limit myself to such specific structure except as hereinafter claimed.

lI claim 1. A Vtool holder for tools having angular heads connected with the shanks thereof by conical portions, comprising a body formed with a socket to receive andrfit the. head of the tool and with atubular-extension beyond the socket having its outer end portion internally screw-threaded and its interior relieved inwardly ofthe screw threads to a diameter greater kthan the interior diameter of the sleeve at the base of the screw threads,

- and a segmental sleeve externally screwthreaded to loosely engage the screw threads of said extension, the inner ends of the segments of the sleeve engaging said conical portion of an engaged tool to be spread thereby whereby the threads of the sleeve are firmly engaged with the threads of the tubular extension and-the outer ends of theV segments of the sleeve clamped upon the shank of the engaged tool.v

2. A tool holder for tools having angular heads connected with the shanks thereof by conical portions, comprising a body formed with a socket to receive and yfit the head of the tool and with a tubular extensionbeyond the socket having its outer end portion internally screw-'threaded and its interior relieved inwardlyof the screw threads to a diameter ygreater than the interior diameter of the sleeve at the base of the screw threads, and a segmental sleeve externally screwthreaded to loosely engage the screw threads of said extension, the inner ends of the segments of the sleeve engaging said conical portion of an engagedk tool to be spread thereby whereby the threads of the sleeve are firmly engaged with thethreads of the tubular extension and the outer ends of the segof the sleeve at the base of the screw threads,

and a segmental sleeve externally screwthreaded to loosely engage the screw threads of said extension, the inner ends of the segments of the sleeve engaging said conical portion of an engaged tool to be spread thereby whereby the threads of the sleeve are firmly engaged with the threads of the tubular extension and the outer ends of the segments of the sleeve clamped upon the shank of the engaged tool, the outer ends of adjacent faces of said sections being provided with coacting interengaging portions permitting contraction of the outer end of the sleeve.

4. A tool holder for tools having angular heads connected with the shanks thereof by conical portions, comprising a body formed with a socket tb receive and fit the head of thetool and with a tubular extension beyond the socket having its outer end portion internally screw-threaded and its interior relieved inwardly of the screw threads to a diameter greater than the interior diameter of the sleeve at the base Vof the screw threads, and a segmental sleeve externally screwthreaded to loosely engage the screw threads of said extension, the inner ends of the segments of the sleeve engaging said conical portion of an engaged tool to be spread thereby, the outer faces of the inner ends of said segments being relieved.

5. A tool holder for tools having angular heads connected with the shanks thereof by conical portions, comprising a body formed with a Asocket to receive and fit the head of the tool and with a tubular extension beyond the socket having its outer end portion internally screw-threaded and its interior relieved inwardly of the screw threads, and a segmental sleeve externally screw-threadedv inner ends by the engagement of said inner ends with the conical portion of the tool.

6. A tool holder for tools having angular heads connected with the shanks thereof by conical portions, comprising a body formed with a socket to receive and fit the head of the tool and with a tubular extension beyond the socket having its outer end portion internally screw-threaded and its interior relieved inwardly of the screw threads, and a segmental sleeve externally screw-threaded to loosely engage the screw threads of said extension whereby continued rotation of the sleeve will cause the sections to spread at their inner ends by the wedging action of the conical portion of the tool forcing the threads into rm engagement with the threads of the tubular extension.

7 A tool holder for tools having angular heads connected .with the slianks thereof by conical portions, comprising a body formed with a socket to receive and fit-the head of the tool and with a tubular extension beyond the socket having its outer end portion internally screw-threaded and its interior relieved inwardly of the screw threads, and a segmental sleeve externally screw-threaded to loosely engage the screw threads of said extension whereby continued rotation of the sleeve will cause the sections to spread at their inner ends by the wedging action of the conical portion of the tool forcing the threads into rm engagement with the threads of the tubular extension, the inner end portion of the segmental sleeve being externally reduced to thereby permit greater expansion of said inner ends.

In testimony whereof I hereunto aiiX my signature.

WILLIAM A. PECK. 

